Arduino Spooky Projects Class1

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Spooky Projects Introduction to Microcontrollers with Arduino Class 1 7 Oct 2006 - machineproject - Tod E. Kurt Everyone’s had a little programming experience, right? Who’s had any electrical experience?
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Transcript of Arduino Spooky Projects Class1

  • Spooky Projects

    Introduction to Microcontrollers with Arduino

    Class 1

    7 Oct 2006 - machineproject - Tod E. Kurt

    Everyones had a little programming experience, right?Whos had any electrical experience?

  • Whats for Today

    Introduction to Arduino Building an LED flashlight Making some blinky LED eyes

  • Class Kit

    Whats in your goodie bag

  • Class Kit Manifest Arduino NG USB board

    Arduino ProtoShield

    Solderless breadboard

    USB cable

    RC servo

    piezo buzzer

    6m hookup wire in ghastly colors

    potentiometer with knob

    R,G,B and mystery LEDs

    two push switches

    9V battery and connector

    220, 330, 10k, and 1M resistors

    light sensitive resistor

    5.1v zener diode

    square of velcro

    scary eyeballs

    And other bits as we progressIgnore most of the kit for now, just use Arduino board and USB cableComplete kit manifest with part numbers will be online

  • A Word on Safety

    Electronics are toxic to you Lead in some of the parts Wash up afterwards

    You are toxic to electronics Static-sensitive: dont shuffle your feet Wires only bend so much

  • What is Arduino?

    Open Source Physical Computing Platform open source: free to inspect & modify physical computing. er, what? ubiquitous computing, pervasive

    computing, ambient intelligence, calm computing, everyware, spimes, blogjects, smart objects...

    A physical board, a programming environment, a development philosophy

    Tiny computer you can program Completely stand-alone, talks to other devices

    Physical computing as invisible computingCan run off a batteryCan talk to other computers, cell phones, etc.

  • What is Arduino?

    Based on AVR-GCC, avr-libc, AVRlib and Processing (all open source projects)

    Very similar to Basic Stamp (if you know it) but cheaper, faster, & open

    Uses AVR ATmega8 microcontroller chip

    Basic Stamp uses PIC microcontroller chip.PICs and AVRs are very comparable, ones not necessarily better than the otherAVRs are a little better if youre using a language like C (stack-based)Dont need to worry about the chip particulars for now

  • What is Arduino?

    Why not just use a bare AVR ATmega8 chip?

    Arduino is also a standardized bootloader A tiny program that loads other programs Its alive during first 5 seconds

    A bootloader is akin to an BIOS on a real computer. It handles the startup of the chipAfter 5 seconds, your program runsDont need special programmer board with a bootloaderArduino can work with other AVR chips, some are smaller than your fingernail, cost ~ 40 cents

  • What is Arduino?

    Capabilities 8 kBytes of Flash program memory 1 kByte of RAM 12 MHz (Apple II: 1 MHz) Inputs and Outputs 13 digital input/output pins 5 analog input pins

    Digital I/O can read switches and buttons, control LEDs and motorsAnalog input can read knobs or other varying sensors Analog output can be done with PWM

  • What is Arduino?

    Write programs on your PC Download them into the Arduino board Arduino board can then be used by itself

    But how do you program it?

    No keyboard, mouse or displayYour PC becomes the head

  • Arduino Board







    digital input/output

    analog inputAlso: USB input, power input, ICSP programming header

  • Arduino Board

    analog inputs




    digital I/O

    Diagrammatic version, to simplifyBut of a slightly older version of the board

  • Digital? Analog?

    Digital only has two values: on/off Analog has many (infinite) values

    Computers dont really do analog So they fake it, with quantization

    Quantization = breaking up the analog range into bins. The number of bins is the resolution.More bins = higher accuracy, but is more complexDigital can be thought of as only two bins.

  • Arduino Software


    upload to board


    Thats the full code for blinking an LED, btw.Arduino defines several useful functions like digitalWrite() and delay(). more on that laterProcessing and Wiring not needed

  • Arduino & Processing

    build generative art or other applets easilynot needed for Arduino, but can work with it

    Arduino has essentially the same GUI as ProcessingEasier than Arduino, since all softwareThough similar UI and philosophy, Arduino is a different languageWell use Processing later in the class to let the computer control Arduino & vice-versa

  • Download software: Mac OS X PPC or Intel (must pick) Windows 2000/XP

    Install drivers In drivers folder, pick appropriate one Windows: unzip driver, plug in board, setup macosx-setup-command for Mac folk


    Installing Arduino

    Different Arduino downloads for each operating systemDifferent drivers for each OS toomacosx-setup-command must be run before reboot,but, it will go away in next version

  • Using Arduino Programs are called sketches Load up example sketch led_blink

  • Errors

    Must select serial port

    Programmer is not responding

  • Whats my serial port?

    Windows: Use Device Manager to find COM portMac: Its called /dev/tty.usbserial-something

  • Using Arduino

    Write program

    Compile (check for errors)

    Reset board

    Upload to board

    Try it out with led_blink!

    On reset, board will flash on-board pin 13 LED really fast for a split-second to indicate bootloader existsWhen uploading, TX/RX lights will flash as data is transferredThen the board resets, pin 13 will flash fast againFinally, your program will run

  • Arduino Board Lifecycle

  • Take a Break

  • Making Circuits

    heart pumps, blood flows voltage pushes, current flows

  • LEDs

    physical characteristics schematic symbol

    LED = Light-Emitting Diode electricity only flows one way in a diode

    Needs a current limiting resistor, or burns out

    bar = minus

    Many types of integrated lenses. Some project a narrow beam (like the ones in this class), some project a very wide beam

  • LED flashlight

    wiring diagram schematic

    All LED circuits are essentially this: power source, current limiter, LEDFlat part of LED goes to negative, like bar in schematicThe higher the resistance, the dimmer the LED; the lower, the brighter

  • LED flashlight

    Take out solderless breadboard, resistor, LED, and battery and make a circuitLEDs have been marked a little as to what color they are, but color doesnt matter here

  • Solderless Breadboards

    groups of 5connected

    but not connectedacross the jump not


    Insert wires into holes to make a connection.*Much* easier, quicker than solderingBut, they wear out, are expensive ($8 for this little one)

  • Using Solderless Breadboards

    Using needle nose pliers can help

    Grab wire or lead toward end and push into hole

  • Blinky LED circuit

    wiring diagram schematic

    hello world of microcontrollers

    In schematics signals often flow from top-left to bottom-rightCommon nodes like gnd are given their own symbolPick any digital pin to hook up to, doesnt matter which

  • Blinky LED circuit

    Plug shield on top of Arduino board Stick breadboard to shield

  • Blinky LED Software

    Youve already seen it.

  • Arduino Sketch Structure

    Declare variables at top Initialize setup() run once at beginning, set pins

    Running loop() run repeatedly, after setup()

    Pins can be changed in loop() too, but conceptually easier in setup()

  • Arduino Language Language is standard C (but made easy) Lots of useful functions

    pinMode() set a pin as input or output digitalWrite() set a digital pin high/low digitalRead() read a digital pins state analogRead() read an analog pin analogWrite() write an analog PWM value delay() wait an amount of time millis() get the current time

    And many others. And libraries. And examples!Also: serial library, LCD library, servo examples

  • Development Cycle

    Make as many changes as you want Not like most web programming: edit run Edit compile upload run





  • More Blinky MadnessAdd LEDs

  • Next Week

    Reading buttons Reading analog values (knobs) Detecting the dark More complex LED circuits Stand-alone Arduino

  • Tod E. Kurt

    [email protected]

    END Class 1

  • ATmega8 & Arduino